package com.atguigu.day12.morning.m2;

public class Test04 {
    public static void main(String[] args) {
        A a1 = new A();
        A a2 = new B();
        B b = new B();
        C c = new C();
        D d = new D();
        System.out.println("(1)" + a1.show(b));
        System.out.println("(2)" + a2.show(d));
        System.out.println("(3)" + b.show(c));
        System.out.println("(4)" + b.show(d));
    }
}